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At least 775 records · Page 43Linked to original sources
PubMed1984

[Electronic indicators for determining the optimum moment for inseminating cows and sheep].

Three types of electron indicators to measure the electric resistance of the vagina with cows and ewes are described. The first type of such indicators gives a direct scale record of resistance as measured in ohm units. The remaining two types present a simpler construction, and are intended for practical purposes, pointing to the threshold value of resistance. It has been found by means of these indicators that the optimal time for insemination in the case of cows is when the electric resistance is lower than 250 omega; for ewes--when the resistance is lower than 550 omega. The indicators rate totally designed with Bulgarian transistors and integral schemes.

Animals↗
PubMed1984

[Reaction of the ovary of the young rat to transplantation into the spleen of adult castrated diabetic animals].

The ovary of an infantile rat was grafted into the spleen of adult castrated females. After 7-9 days half of the animals were injected with alloxan subcutaneously. The rats were decapitated 33 days after ovary grafting. In all diabetic rats and 62% of the control animals, the vaginal smears showed persistent diestrus. The height of the uterine epithelium was fairly low. Persistent estrus was detected in 38% of the control animals. In the diabetic group, the degree of ovarian hypertrophy was significantly lower than in the control group, although no differences were discovered in pituitary gonadotropin content in both the groups. It is suggested that the pituitary of diabetic animals slightly responds to estrogenic deficiency. This was manifested in a lesser degree of ovarian hypertrophy and in the absence in the ovaries of the majority of diabetic rats of the phenomena such as the proliferation of the connective tissue and the appearance of granulocellular tissue accumulations.

Aging↗
PubMed1983

Use of prostaglandin F2 alpha in the treatment of unobserved estrus in lactating dairy cattle.

A field trial was conducted to evaluate the use of prostaglandin F2 alpha (PGF2 alpha) (lutalyse)a in lactating dairy cattle with unobserved estrus in the presence of a functional corpus luteum (CL) and clinically normal reproductive tract. Seventy-three Holstein and 9 Jersey cows, weighing between 340.0 and 772.7 kg, were allotted to treatment and control groups. All treated cows were inseminated within 80 hours after treatment as assigned by this trial. Control cows were inseminated at the first observed estrus. Of the treated cows, 50% showed estrus within 80 hours after treatment. In this trial, 96% of the treated cows and 92% of the control cows were determined to have at least 1 functional CL on the day of treatment. For the treatment group and the control group, mean serum progesterone concentrations were 4.1 ng and 3.5 ng (P less than 0.2, by Student's t test), respectively, on day of treatment and were 0.4 ng and 5.0 ng (P less than 0.005, by Student' t test) on day 5 after treatment. Pregnancy rates were 57% for treated and 47% for control cows (P = 0.5, by X2). Days from treatment to first-observed estrus, treatment to first service, and treatment to conception were significantly reduced in the treatment group compared with these criteria for the control group (P less than 0.05, 0.005, and 0.01 respectively). It was concluded that induction of luteolysis with PGF2 alpha in lactating dairy cattle with unobserved estrus and a palpable functional CL will be an effective addition to reproductive health programs.

Animals↗
PubMed1978

Monitoring of plasma and milk progesterone for evaluation of postpartum estrous cycles and early pregnancy in mares.

Plasma and milk progesterone concentrations in 13 mares were determined 3 times a week for 5 months, beginning at parturition. The estrous cycle was divided into 2 phases. Estrus was considered to occur when the plasma progesterone concentration was less than 1 ng/ml, with diestrus occurring when plasma progesterone content was greater than or equal to 1 ng/ml. Based on this classification, the period of estrus averaged 8.9 days, diestrus averaged 13.9 days, and the estrous cycle averaged 22.8 days. During estrus, the progesterone concentration in plasma averaged 0.4 ng/ml and in milk averaged 2.2 ng/ml. During diestrus corresponding values were 6.8 and 6.9 ng/ml. In the early pregnant mare, the average progesterone concentration was 5.4 ng/ml for plasma and 4.7 ng/ml for milk. The progesterone pattern was similar in milk and in blood plasma, and the correlation between 362 paired values was 0.7 (P less than 0.01). It was concluded that the estrous cycle of the mare can be mapped accurately by measuring plasma or milk progesterone content at 2- to 3-day intervals. A breeding program based on monitoring blood progesterone was outlined.

Animals↗